A crystalline plate cut parallel to its optical axis is 0.25mm thick and serves as a quarter-wave plate for a wavelength lambda = 530nm . At what other wavelength of visible spectrum will it also serve as a quarter-wave plate? The difference of refractive indices for extraordinary and ordianry rays is assumed to the constant and equal to n_(e) - n_(0) = 0.0090 at all wavelength of the visible spectrum.
What is the wavelength range of audible sound and visible light ?
What is the order of wavelength of visible light and audible sound?
